linux-kernel - Re: [PATCH 2/2] virtio_balloon: fix race between migration and ballooning

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Message-ID: <20160110235409.GA7452@bbox>
Date:	Mon, 11 Jan 2016 08:54:09 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Rafael Aquini <aquini@...hat.com>, stable@...r.kernel.org
Subject: Re: [PATCH 2/2] virtio_balloon: fix race between migration and
 ballooning

On Sun, Jan 10, 2016 at 11:40:17PM +0200, Michael S. Tsirkin wrote:
> On Mon, Jan 04, 2016 at 09:27:47AM +0900, Minchan Kim wrote:
> > > I think this will cause deadlocks.
> > > 
> > > pages_lock now nests within page lock, balloon_page_putback
> > > nests them in the reverse order.
> > 
> > In balloon_page_dequeu, we used trylock so I don't think it's
> > deadlock.
> 
> I went over this again and I don't see the issue anymore.
> I think I was mistaken, so I dropped my patch and picked
> up yours. Sorry about the noise.

No problem. Thanks for the review.